As of 2021 there were 18,210 people employed as Helpers--Brickmasons, Blockmasons, Stonemasons, and Tile and Marble Setters within the United States.
This represents around 0.013% of the employed workforce across the country.
Put another way, around 1 in 7 thousand people are employed as Helpers--Brickmasons, Blockmasons, Stonemasons, and Tile and Marble Setters.